Organization - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Jun. 30, 2018	Feb. 02, 2019
Organization Consolidation and Presentation of Financial Statements [Line Items]
Total cost of convertible note hedge transactions		$ 91,857
Cash proceeds from sale of warrants		51,021
Total cash proceeds, net of discounts upon original issuance and offering costs	$ 287,800
Discounts upon original issuance and offering costs	6,300
Convertible Senior Notes Due 2023 [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Debt instrument, principal amount		$ 335,000
Cash proceeds from sale of warrants	51,000
Convertible Senior Notes Due 2023 [Member] \| Convertible Bond Hedge and Warrant Transactions [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Total cost of convertible note hedge transactions	91,900
Private Placement [Member] \| Convertible Senior Notes Due 2023 [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Debt instrument, principal amount	$ 300,000
Debt instrument, interest rate	0.00%
Over Allotment Option in Private Placement [Member] \| Convertible Senior Notes Due 2023 [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Debt instrument, principal amount	$ 35,000

Debt instrument, discount on original issuance and offering costs.

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- Definition

Net proceeds from issuance of debt and warrants.

+ References

No definition available.

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- Definition

Organization consolidation and presentation of financial statements.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The cash outflow for a financial contract that meets the hedge criteria as either cash flow hedge, fair value hedge or hedge of net investment in foreign operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 27
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3581-108585

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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